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Date:      Mon, 10 Aug 2015 02:15:23 +0200
From:      Jan Beich <jbeich@FreeBSD.org>
To:        Koop Mast <kwm@FreeBSD.org>
Cc:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   Re: svn commit: r286524 - in head: . etc sys/dev/drm sys/dev/drm2
Message-ID:  <bneg-f17o-wny@FreeBSD.org>
References:  <201508091258.t79CwvGj027161@repo.freebsd.org>

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Koop Mast <kwm@FreeBSD.org> writes:

> Author: kwm (ports committer)
> Date: Sun Aug  9 12:58:56 2015
> New Revision: 286524
> URL: https://svnweb.freebsd.org/changeset/base/286524
>
> Log:
>   Add a new group named 'video' with the id of 44. And make drm create
>   devices in /dev/dri/ with this new group.

Would 'video' group include capture devices as well? Linux seems to mix
/dev/nvidia*, /dev/fb* and /dev/video* all under same group despite
all of them have different attack vectors.

> Modified: head/sys/dev/drm/drmP.h
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D
> --- head/sys/dev/drm/drmP.h	Sun Aug  9 12:20:22 2015	(r286523)
> +++ head/sys/dev/drm/drmP.h	Sun Aug  9 12:58:56 2015	(r286524)
> @@ -175,7 +175,7 @@ SYSCTL_DECL(_hw_drm);
>=20=20
>  #define DRM_DEV_MODE	(S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP)
>  #define DRM_DEV_UID	0
> -#define DRM_DEV_GID	0
> +#define DRM_DEV_GID	44	/* "video" group */

Why hardcode? Linux often uses udev(7) rules to assign a group which on
FreeBSD can easily be translated into devd.conf(5) or devfs.rules(5).

Having 'video' assigned by kernel wouldn't eliminate having to run
mergemaster/etcupdate + pw groupmod on upgrade.

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